Sand-blast machine.



H. L. WADSWORTH.

SAND BLASTl MACHINE.

APPLICATION FILED APR. 22| |912.

1 1 '7 1 ,286 Patented Feb. 8, 1916.

J0 2 SHEETS-SHEET I. y

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I Mar/pay H. L. WADSWORTH.

SAND BLAST MACHINE.

APPLICATION FILED APR. 22,'1912.

Patented Feb. 8,1916.

UNITED isTATEs PATENT onirica.

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sAND-Bmsr MACHINE To all whom t may concern:

Be it known that I, HOWARD L."WADswoRTisr, a citizen of the United States, residing at hoga and Stateof Ohio, have invented certain new and useful Improvements in Sand- Blast Machines, of which the following is a specification. v

This invention relates to improvements in sand blast machines generally and particularly to mechanism for controlling the sand feed to the hose line and the supply of sand -to the machine.

Referring to the drawings, Figure 1 is a sectional view of the device; Fig. 2 is a sectional view, part in elevation, showing the controlling v alve; Fig. 3 is an enlarged sectional view of the controlling valve showing the ports in one position; Fig. 4 is-a sectional view with the ports in another position; Fig. 5 isa sectional view of the controlling valve with the ports in still another position; Fig. 6 is a detail view of mechanism for controlling the discharge of sand into the reserve portion of the machine; Fig. 7 shows the tank and trap in section,.together with a discharge hose and discharge nozzle; Fig. 8 is a` longitudinal sectional view of the nozzle; and Fig. 9 is a section upon the line 9-9 of Fig. 8.

a sand blast machine comprising -a tank or main receptacle 1 having a hopper-shaped bottom 2 and a -hopper-shaped .partition 3.

tank into upper and lower separating the The lower hopper bottom 2 compartments.

is provided with a ring 4 having a threaded opening 5, adapted to receive a nipple or pipe connection 6 which supplies sand to the sand and air mixing device.

The mechanism for delivering the mingled sand and air is in the form of a sand and air mixing device, andit comprises a casing 7 havinga connection 8` adapted to thread onto the nipple 6 and communicating with achamber 9 within the casing. The chamber 9 is arranged above a partition 10 extendcasing ing horizontally and longitudinally ofthe and provided at the end with a`projectionjll extending up above the upper surface of the partition 10, as shown. Projecting from the upper art of the `casing is a short partition 12 w ich extends to a point near the partition between the projection 11 and the projection Specification of Letters Patent.

' carrying 10 but is spaced therefromv and is preferably arranged to allow space tends to seat 12 for the sand to be elevated into a channel' or opening 13 extending beyond the end of the partltlon 10 and communicating with a longitudinally disposed chamber 14-bvelow the partition 10. `The end of this casing 7 Patented Feb. s, 1916.

IApplication n leq .April 22, 1912,"` Seria1 No. 692,279. l

is provided with a threaded portion 1`5-for I receiving the discharge pipe 16 which may be supplied with the usual hose and nozzle construction but not shown in the present instance.. The casing l7 at a point oppositeV to the connection 15 or in other words opposed to the discharge, is provided with two air inlet pipes 17 and 18, the pipe 18'commumcating with the chamber 9 and the pipe 17 communicating with the chamber 14. The pipe 18 is provided with a valve 19 for adjustmg the volume of air passing through it, while the pipe 17 isprovided with a valve 2O for regulating the volume of air passing through it; These two pipes are branches of amain line 21 which is connected by a branch 22 wlth` the lower chamber of the tank 1.

The operation of the mechanism already described is as follows: Assumingthat there vis a pressure of air in the line 21 and that the valves 19 and 20 are properly adjusted, air flows into the tank above the sand and `to the chambers 9 and 14 causing the sand to be driven by the stream of air in the line More specifically the invention' relates to 18 below the projection 12 above the projection 1l and into the chamberv 14 toward the discharge pipe 16. At the same time- I the ipe 17 is deliveringa charge of air for furt er completing the mixture and' for further driving the sand through the discharge hose. I

Suitable means is provided for controlling supporting a cylinder 28 at the center. This lcylinder is supplied ywith air through a pipe 29 which is connected to the valve mechanisni .to be described. Within the lcylinder 28 is a piston 30 having 4a rod or stem 31 at' its lower end a valve 32 provided with adapted to seat upon the rubber gasket 26. spring 34 surrounds the rod and normally the valve 32 against the action an upwardly extending @ange 33 l f 69 supply pipe 50 mounted in a support 51 sepiston 30 when the air is exhausted from tion lv8 for the air line 29, and suitable exhanst openings 3.9 and'40, the former ar' of pressure onA the-opposite side ofthe piston 130. This valve 1s adapted to be opened by air supplied/on the upper side of the the llower -chamber of the casing-orA tank and when the lower chamber is lled with sand the machine is ready for operation. f

The pressure vis admitted within the rlower cham er through the `pipe 22 whenktheair.

,will blow over the Aflange 33 andremove any particles of sand which might tend to prevent the closing of this valve.

' The admission of airto the everal lines is controlled by a. single valve comprising a casing 35 having suitable connections 36 and'37 for the main-air line 21, a connecranged between the connections 36l and 38 andthe latter between the connection 37 and the connection 38. This casing isprovided with a tapered opening and with a backv wall 41 'having `an opening'therein for receiving a threaded stem 42 connected to a valve ,plug 43 which is provlded with a through port- 44, a peripheral recess port 45 'and vanother vperipheral recess port 46 connected by a' ort 47 with the main air' line port44. heV arrangement of these ports is such that the following operatlons may be performed. Assuming that themachine is to be started and that the Imain receptacle is empty, the operator swmgsthe valve until the port 46 is in communlcation with the main supply, the port 44 being `then in communication with the pipe 29, the result being that the valve 32 is low' ered and sand flows readily into the lower exhaust 40, as shown in Fig. 2. When the operator wishes to cease operations, the

`valv'e is thrown into the position shown in Fig. 3 and the main .inlet is lapped and. there is no air supply to any of the parts. When it is desired to exhaust the air from the main line, the valve is thrown into the position shown in Fig.` 4.

In order to properly flll the upper chamber the side of the chamber is cut away at 48 and a chute 49 is secured to the outslde of the tank to convey the sand as it passes through the recess 48 and .at the same time the sand is supplied to this chamber by a cured to the side of the tank or casing. This pipe is preferably to one side of the center as shown, or in other words, it is eccentric to the casing, so that it will deliver the sand nearer to the `chute or spout 49 whereby merece '..when the'upper part ofthe casing is filled l pass vdown through thev the overflow wi chute from whence it may be collected in any suitable manner. v he supply pipe 50 may be supplied with a closing device as shown in Fig. 6, and this `f n'ie'clitinism comprises a support 52 secured lto the pipe and carrying an arm 53 support- 1n an air cylinder 54 which is to be suppl1ed=with air by the ipe 55 lin any suitable manner. This cylin er is provided with a piston 'l 56 shown in dotted lines in Fig. 6.

4This piston has a rod 57 fprovided with a pin 58 engaging `in a slot 59 in an arm 60 secured to a valve 61 whichis in the form lof# a scoop vextending over the mouth ofthe pipe and preventing discharge of vsand therefrom.

vA suitable nozzle isl provided for the hose 16 and it comprises a shank 62 which is 'provided with a boss or an enlargement 63 having a threaded shank 64 for apurpose to b e described. This boss or` enlarged portion"63 is provided with a-recess 65 in which is mounted a coiled spring 66 which when distended extends beyond the face yof the enlargement 63. -A pin 67 is securedfinthe enlargement and projects beyond the outer `face as shown, and into a hardened steel disk 68 provided with an opening 69 eccentrically located vwith respect'to the center of the disk. The enlargement 63 is alseccentrically located with respect to -the opening in the shank. Engaging the iat face of the disk 68 is another hardened steel disk 70 provided with an opening 71 adapted when in and also provided with an opening receiving .a pin 72which engages in a ange 73 held with its face against the disk 7 0. This flange is provided with a hollow shank 74, the opening of which alines with the opening 71in the disk 70. This shankand the opening therein are "arranged eccentric to the center'of the iiange 73 in a manner similar to the openings 71 and 69, so that when these parts are inv one lposition they aline and furnish a discharge from the 4shank 62 or from the hose 16. The end of the shank 74 is provided with the usual hardened steel nozzle 75 held in place by a suitable sleeve 76. The several parts, including the flange L 73, are held in place upon the enlargement .63 by means of a coupling 77 which is `screwed onto the threaded portion 64.

The arrangement of the parts is such that the flange 73'and the disk 70 may turn freely within the coupling 77 and against the face ofthe steel disk 68 and by reason of the eccentricity of the openings in the several parts, the flow through the nozzle arrangement may be cut off as desired.

vHaving described my invention, I claim:

1. In a sand blast machine, a sand receptacle having a hopper bottom, and a mixing 011e position to register lwith the opening 69 and discharge device at the lower end of said hopper bottom and" comprising a casing. in communication with the receptacle, said .casing being provided with an air channel, a sand channel communicating with said air channel at the top, a sand trap located in said sand channel and preventing the gravitation of the sand into 'the air channel, means for driving the sand from the sand channel, and means for supplying air to the air channel. j 4

2. In a sand blast, a sand receptacle, and a mixing device comprising a casing, an air channel, a sand channelv communicating therewith, -a sand inlet tothe sand channel, a trap arranged in said sand channel comprising suitable projections forming the trap, an air line for driving the sand from said trap, and an air line connected to the air channel.

3. In a sand blast, a sand receptacle, a mixing device comprising a casing connected to the tank b a sand inlet, a sand outlet, lan air channe substantially in alinement with said sand outlet, a sand channel communicating with said air channel at a point out of alinement with the sand inlet, a projec-- tion extending upward into the sand chan` nel, a projection extending downward into the sand channel nearer the sand inlet, said projections in said sand channel forming a trap for preventing the free discharge of v 'in presence of two witnesses.

HOWARD L. W'ADSVVORTI-I.V

Witnesses:

e G. O. FARQUHARSON,

C. H. TRESCH. 

